纯粹的函数性语言不依赖保存或检索状态的操作，因此不允许破坏性赋值。
Pure functional languages do not rely on operations that save or retrieve state and do not allow destructive assignments.
如果这些方面中有任何一些失败了，那么结果将是破坏性的，影响操作成本及客户满意。
If any of these areas fail, the results can be devastating, affecting operational costs and customer satisfaction.
如果恢复功能实现正确，整个系统只会有一个破坏性的操作：清空垃圾箱。
If undo is implemented correctly, then there's only one destructive operation in the entire system: emptying the Recycle Bin.
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